Influence of watering filled-up rock massif on geomechanical stability of the cyclic and progressive technology line

Abstract

Purpose. Comprehensive assessment of the fill slope stability for cyclical-and-continuous technology (CCT) conveyors applied to rocks of stripping at Pervomaiskiy quarry of PJSC "Severnyi GOK" to justify effective antilandslide measures. Methods.To study geomechanical stability of fill-up rock mass and slopes of the CCT line, the following methods are used: hydrogeological analysis, visual observation of the object, numerical modeling of the fill slope stability in the finite element analysis software Phase2. Findings.Calculations of the fill slope stability for the open belt conveyor gallery, the bases of the embankment mass and pit wall slopes show that the fill-up mass stability is conditioned by the complex effect of geological, hydrogeological and anthropogenic factors. The geometrical parameters of CCT facilities and physical-mechanical properties of the embankment rocks play a key role in ensuring the stable operation of the CCT line and its sustainability. The numerical modeling of different options to strengthen the slopes of the fill-up mass is carried out, the most effective techniques for these purposes turned out to be surcharges, different in geometry, and retaining prisms of rocks.Originality. The stability margins (SM) for the fill-up mass and slopes on cross-section profiles considering physical and mechanical properties of the complex-structured fill-up mass, its water content and loads of mining equipment are calculated. The areas most subjected to geomechanical deformations and displacements are identified. Practical implications.Based on the simulation results, anti-landslide measures are developed to ensure the stable operation of the CCT complex and stability of the embankment slopes and the pit walls. : cyclical-and-continuous technology (CCT), open pit slope stability, stability of fill-up rock mass, landslide, rock mass water content, stability margin, Mohr-Coulomb failure criterion Keywords ВВЕДЕНИЕНасыпные массивы вскрышных пород являются неотъемлемой частью технологии открытых горных работ. Создание значительных объемов дисперсных несвязных насыпных образований в виде внешних и внутренних отвалов коренных пород вскрыши, гид-ротехнических сооружений, путепроводов и прочих техногенных породных массивов требует постоянно-

Development of the landslide hazard control system of natural and man-made slopes

“…The use of appropriate levels and gradations of the stability of natural and man-made slopes is a key element in the evaluation and forecasting of their landslide hazard. Regarding geotechnical objects of openpit mining of minerals, the known scales of the values of the safety factors for slopes and pit walls, as well as dump arrays are used [14]. To evaluate the stability of natural slopes, such a gradation of the landslide hazard levels is absent.…”

“…As a result of numerical simulation, it is found that in homogeneous slopes without attenuation surfaces, significant deformations are practically absent with a SF ≥ 1.5 [14,15]. This state of the soft rock massif is objectively characterized as the most stable, therefore, the landslide hazard level is «low», which makes it possible to assign this position to the I class of hazard level according to the proposed scale.…”

Study of hydroerosion process parameters of zeolite-smectite tuffs and underlying rock

“…The influence of well-known laws of mechanics is manifested in the conditions of borehole hydromining (BHM). They are expressed in the manifestation of the balance law of mining pressure work, the results of which, in the conditions of hydraulic mining, are proportional to the loss of minerals in the subsoil [17]. Based on this, the main task of mountain pressure management is to maximize the share of work that goes to the safe deformation of the massif outside the excavation chambers, and to minimize it -to the deformation of the roof and protective units.…”

Research of the properties of quarry tuff-stone for complex processing

“…To model the process of softening of tuff-stone, it is of considerable interest to determine the analytical type of dependence on which the dehydration process takes place. Sample № 7 was taken for the study as the most characteristic for dump tuff-stone [15][16][17]. The analytical dependence of the species was established, and it is assumed that this dependence reduces the mass of the sample over time during dehydration.…”